PHP Key Utils v2.0.3

This is a patch update that provides the following:

  • Dependency updates

What's Changed

  • Updated phpunit/phpunit to 10.5.20 in composer.json and GitHub Actions
  • Updated README to reflect the 2.0 version

Full Changelog: https://github.com/bitpay/bitpay-php-keyutils/compare/2.0.2...2.0.3